In the past, shareholders received a physical paper stock certificate that indicated that they owned "x" shares in a company. Today, brokerages have electronic records that show ownership details. Owning a "paperless" share makes conducting trades a simpler and more streamlined process, which is a far cry from the days were stock certificates needed to be taken to a brokerage before a trade could be conducted.

While shares are often used to refer to the stock of a corporation, shares can also represent ownership of other classes of financial assets, such as mutual funds.